/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.javaee7.servlet.filters;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;

/**
 * @author Arun Gupta
 */
@WebFilter(filterName = "FooBarFilter", urlPatterns = { "/filtered/*" })
public class FooBarFilter implements Filter {

    private FilterConfig filterConfig;
    
    @Override
    public void init(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        PrintWriter out = response.getWriter();
        CharResponseWrapper wrappedResponse = new CharResponseWrapper((HttpServletResponse) response);

        doBeforeProcessing(request, wrappedResponse);
        chain.doFilter(request, wrappedResponse);
        doAfterProcessing(request, wrappedResponse);

        out.write(wrappedResponse.toString());
    }

    @Override
    public void destroy() {
    }
    
    private void doBeforeProcessing(ServletRequest request, ServletResponse response) throws IOException, ServletException {
        try (PrintWriter out = response.getWriter()) {
            out.print("foo--");
            out.flush();
        }
    }

    private void doAfterProcessing(ServletRequest request, ServletResponse response) throws IOException, ServletException {
        try (PrintWriter out = response.getWriter()) {
            out.print("--bar");
            out.flush();
        }
    }

}
